198006881 has 2 divisors, whose sum is σ = 198006882. Its totient is φ = 198006880.

The previous prime is 198006863. The next prime is 198006883. The reversal of 198006881 is 188600891.

198006881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143616256 + 54390625 = 11984^2 + 7375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198006881 is a prime.

It is a super-2 number, since 2×198006881² = 78413449846696322, which contains 22 as substring.

Together with 198006883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198006883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99003440 + 99003441.

It is an arithmetic number, because the mean of its divisors is an integer number (99003441).

Almost surely, 2^198006881 is an apocalyptic number.

It is an amenable number.

198006881 is a deficient number, since it is larger than the sum of its proper divisors (1).

198006881 is an equidigital number, since it uses as much as digits as its factorization.

198006881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 198006881 is about 14071.4917830342. The cubic root of 198006881 is about 582.8544200564.

The spelling of 198006881 in words is "one hundred ninety-eight million, six thousand, eight hundred eighty-one".